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# Simple Machines

Simple Machines. SOL 3.2. Machine – a tool that helps us do work. Machines help us by: Changing the amount of force on an object. Changing the direction of the force. Force is a push or pull that changes the motion or shape of an object. Example: I push a bookshelf to move it.

## Simple Machines

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1. Simple Machines SOL 3.2

2. Machine – a tool that helps us do work Machines help us by: • Changing the amount of force on an object. • Changing the direction of the force.

3. Force is a push or pull that changes the motion or shape of an object. Example: I push a bookshelf to move it.

4. Energy is the ability to do work. Example: I must have energy to run the mile.

5. Work is the result of force moving an object. Example – Picking up something heavy is hard work!

6. Gravity Gravity is the force that constantly pulls objects toward Earth.

7. Lever Inclined Plane Wedge Screw Wheel and Axel Pulley Simple machines – have few or no moving parts

8. Lever –made of a board or bar set on top of a fulcrum. It is used to lift weight Example: seesaw, crowbar, baseball bat, rake

9. Inclined Plan – a slanted surface to make lifting easier Example: ramp, stairs

10. Wedge – two inclined planes together used to raise an object or split an object. Example: knife, door wedge, ax

11. Screw – an inclined plane wrapped around a pole or shaft that is used to hold materials together or drill holes. Example: drill bit, screws

12. Wheel and Axel – a wheel that turns on a post to help move things quickly and easily Example: steering wheel, doorknob, screwdriver

13. Pulley – made of rope and string wound around a reel to change the direction of a force. Example : flagpole, clothesline, cranes, fishing reel

14. Compound Machine – two or more simple machines working together. Examples: Bike Car

15. How Work is Done Energy Force Function Work is done!

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